$ git clone -n https://src.fedoraproject.org/rpms/libcxx.git /var/lib/mock/f33-build-562756-65878/root/chroot_tmpdir/scmroot/libcxx
Cloning into '/var/lib/mock/f33-build-562756-65878/root/chroot_tmpdir/scmroot/libcxx'...
$ git reset --hard ff025fe5ec1e5077e5f1ec2bf20b10e0c6c17956
HEAD is now at ff025fe Fix NVR